Telephone system



Oct. 6, 1936. w. PINELL TELEPHONE SYSTEM 2 Sheets-Sheet 1 Filed April 11, 1935 ATTORNEY.

Oct. 6, 1936. w. PINELL 5,

TELEPHONE SYSTEM Filed April 11, 1935 2 Sheets-Sheet 2 v FIG. 3

q q 57p G 290 I hr .1; m2 1:

68K w 16hr 9 7V1 INVENTOR. WALTER PINELL,

ATTORNEY.

Patented Oct. 6, 1936 UNITED STATES PATENT OFFICE TELEPHONE SYSTEM Application April 11. 1935', Serial No. 15,885 In Germany April 14, 1934 7 Claims.

For the control of numerical impulse trains in long distance communications, especially in telephone systems for any purpose whatsoever, for example for reckoning the calculated fee for an 5 established connection, switching on to another line, preventing undesirable connections, etc., a discriminator is used which is placed in the calling path or is capable of being connected to the path and which is controlled by the numerical l impulse trains transmitted from the station making the call. If the first of the numerical impulse trains operating over the connecting point of a discriminator are not to exercise control, but only the control of the later trains, for example the 15 third or fourth train is desirable, it is necessary either to allow all the impulse trains, including the non-controlling ones to act upon the discriminating device or for the latter to suppress the first non-controlling impulse trains. Such ar- 20 rangements can, however, be very unsatisfactory in some circumstances, for it may be necessary in the first case to provide several discriminators for the reception of these impulse trains, or discriminators with large contact banks and sev- 25 eral sets of wipers, or several relay groups through relay selectors. But the arrangements by which the non-controlling impulse trains exert noninfluence on the discriminating device may be unsatisfactory particularly when it is. a

30 question of suppressing several impulse trains,

for this is only possible by correspondingly complicated control and change-over switching, which generally necessitates a considerable number of control relays.

35 The present invention now makes possible a control of the first numerical impulse trains, which become active after the partial establishment of the connection by the simplest means whereby the first non-controlling impulse trains 40 passing through the connecting point of the discriminator influence the latter only in a definite way independent. of the number of the impulses, and on the termination of these non-controlling numerical impulse trains, switching means be- 5 come active which bring the discriminator under the influence of further individual numerical impulse trains transmitted from the calling station.

The arrangement according to the invention can now be set up so that, in a definite call direc- 50 tion the number of the non-controlling impulse trains can be increased or diminished whereby the switching means, depending on the call number, e. g., depending upon the operation of a numerical impulse receiver in the call route, pro- 55 duces such switching asto bring the discriminator sooner or later under the influence of the. numerical impulses transmitted from the. calling .station.

Furthermore, the arrangement according to the invention can be so set up that the settings 5&1. of the discriminator used for the supervising of the latter by non-controllingimpulses are also employed for the control of the numerical impulse trains.

In the drawings some embodiments of the ink vention are shown, and Fig. 1 shows an embodimentof the invention used for a telephonesystem with automatic operation. The discriminating device influenced by the numerical impulsetrains. effects difierent switchings according to the. value of the individual numerical impulse trains, corresponding to the selected call direction or the. call facility of the calling station, which effects the operation of the meter corresponding to the fee for an established connection; or the switching over of the calling subscriber from the seized line to another line; or the prevention of a definite line being connected by the. call of a subscriber not entitled to this connection. It is evident that the invention can find application for any similar object whatsoever, for example, the connection of an operator in the case ofcallsin a particular direction, the switching of control apparatus for measuring or statistical-work, etc.

Figs. 2 to 4 show further modes of application for the control of the discriminator.

The manner of operation of'the form shown in Fig. 1 will be explained first.

The discriminating device ML consisting of a. stepping switch is attached to a first group selector (I. G. W.). This group selector can. bereached by two different routes, one by the path at, bl, cl, dl from the subscribers who are entitled to set up a call in all directions, and the other by a2, b2, 02. d2, from subscribers who are only entitled to establish calls in one fixed direction; In the following description the call which is established by a subscriber entitled to all calls is first illustrated.

The calling subscriber seizes the first group v selector I. G. W. over the circuit shown al,'bl, cl, dl, whereby relay 0 can energize over' lead cl and its winding I and the off normal contact IKGW of the group selector. Relay C is fitted with a delayed armature make and break. It accordingly closes its contact 20 slowly. Simultaneously with the seizing of the first group selector 1. G. W. the callingsubscriber's talkingline leads. which are notshown, were connected with leads al and. bl. According to. the line phone feeding current of the calling subscriber, through windings I and II. This energizes a short circuit relay V2 at its contact 3a. The

contact 2c being closed the following circuit is set up: pole of contact 20, winding Iror relay 0, contact 30., winding I of relay VI+pole f battery. Relay VIprepares the switching device of the group selector for operation by the numerical impulse train transmitted from the call-v ing station, and so long as it is energized regulates the group selector in the known manner.

The driving magnets controlling the group selector are not shown in the diagram; The control of the group selector can take place in any Way desired. It has beenomitted since it is not concerned with the object of the invention.

The first impulse train transmitted from. the calling station activates the group control of I. G.' W. At the first numerical'impulse of this train contact 3a is opened and 4a is closed. In consequence the short circuit of relay V2 is removed;. this therefore energizes and closes through contact 5222 the following circuit for the rotary magnet Dml of' the discriminator Ml: pole of battery, magnet Dml, wiper 6, contacts 1, 5112, 8121, SM, pole of battery. The rotary magnet Dml promotes the advancement of wipersB and ll! of the discriminator to the next switch position. The wiper 6 then stands on contact H. 'At the end of the impulse train as relay A again remains energizedforsome time, relay V2 releases closing its contact I 2222 35' and thereby provoking the renewed energizing of the rotary magnet Dml through contact ll. Wipers 6 and I0 thereupon proceed to the next switch position, in which wiper 6 stands on contact l3.

After the settingof the'group selector by the first numericalimpulse train there follows the automatic selection of a free connecting. lead of the selectedcall'direction. On finding one the winding l of test relay P is connected to the pole of the battery through contact 351M, the relay, energizes across wiper 36; protects the selected lead against selection'by another seeking group selector by short circuiting the high resistance winding! at its contact p, and connects the speech leads to contacts 32p and 31p which makes-possible the transmission of further, numerical impulse trains from the. calling station to the arranged numerical impulsereceiver'through impulse receiving contact Ila.

It is thus clear that the discriminator being independent of the number of the first train forming impulses was only influencedin a set way. That. is to say, it only advances two steps,

7 r the first at the beginning ;of the impulse train and the secondatthe end of this. 7

In the-sa'mefway the subsequent switching of wipers 6 and I O-is performed at the beginning and end of the second impulse train. At the end of the second impulse train wiper 6 rests on'contaotxlL' If the third impulse train is-to be operative relay V2 again promotes the further switching of the discriminator by energizing rotary-magnet Dml. The wiper 6 :now comes to contact I 5.

These three impulse trains are for setting'upthe connection, not for controlling. When now at the endof this third impulse train relay V2 deenergizes, a winding lflof relay Hr is thereby \egngiected through the circuit closed by contact on contact 2| This winding is of such a high resist-- ance that the rotary magnet Dml cannot energize in this circuit. Thus a further switching of the discriminator at the end of the last noncontrolling impulse train does not take place. Relay HR is now connected through its contact l6hr to contact I11! and. prepares over its wind ing II, a locking circuit and later, at contact I8hr prepares a circuit for the driving magnet Dml of the discriminator in which the'latter is advanced correspondingly to the number of impulses forming the fourth impulse train. This circuit which is closed at each deenergizing of relay A, runs as follows: pole of battery, rotary magnet Dml, contact 18hr, l9a, 2017i, 26 pole of battery.

Suppose that the fourth impulse train consists of five impulses. Wiper I0 has been set Suppose also that only one impulse train is to perform the controlling, so

' that after the fourth impulse train has operated,

train, the following circuit is closed through contact 22222 which closes at the end of thistrain: pole. of battery, contacts 2202 and 2372.1", wiper 24, one of the contacts 25, auxiliary relay F, pole of battery. The auxiliary relay F breaks at contact 26f-the circuit through which the rotary magnet Dml of the discriminator is operated by the impulses of the fourth train transmitted from the calling station. The call established by the calling station .is an expensive one. But it is entitled to this call since group selector IGW has beenreached through seizing lead Cl. Relay BR is thus not excited. During the conversation no switching operation passes the discriminator through this connection. Firstlyat the end of the conversation an activation of the meter of the calling station results, corresponding to the charge for the connection established. In order to do this an assessor AB is provided whose bank contacts are wired to the bank contacts of the discriminator, which are wiped by. the wiper l0 of the discriminator. 'Contact 2| on which the wiper l0 rests by the above connection, is thus connected to bank contact 21;

The calculation of the fee by the meterofthe calling subscriber now proceeds in'the following way: at the end of the connection the calling subscriber replaces his receiver} In consequence relay A becomes deenergize'd and winding II of relay C short circuits at its contact 4a. Relay C releases, opens its contact 280 and 290 closed during the connection and closes its contact 300 and 3 lo. Through contact 300 and 32p the winding II of relay VI is connected tothe wiper 33 of the discriminator IGW and'thence to the lead connected toit. As it is a question of a paying'call the pole of thebatteryis connected to this lead in some way or another, for example through-the final selector, in consequence of which relay VI since it is fitted with a delayed armature release nectedto this lead this relay is energized and promotes the operationof the assessor and thereby the transmission of the meter impulses to themeter of the calling subscriber.

By energizing, relay ZR closes its contact 4021* which establishes the following circuit: pole of battery, contacts Me, 4021', driving magnet Dab of the assessor, contacts 420, 43p| 44m, 45p, pole of battery. The rotary magnet Dab energizes and the assessor advances a step. Through contacts dub and 410i the relay E energizes which connects the pole .of the battery at the contacts 480 to the incoming lead cl and thereby on account of the amplification of the current over these leads, activates the meter of the calling subscriber. Relay E also opens the circuit of the magnet Dab at its contact Me. This deenergizes and at, contact 46 opens the circuit of relay E which in its turn closes the circuit for the magnet Dab. This play between Dab and relay E continues sending an impulse over lead'Cl with everyen-ergizing of relay E, until relay P! is energized by wiper48 reaching contact 21: poleof battery, contact 49hr, wiper l0, contacts 2| and 21, wiper 4B, relay Pl-re pole of battery. Relay PI opens the circuit for the driving magnet Dab at contact 43pl. The assessor is brought to rest. The meter of the calling subscriber has been advanced a number of steps corresponding.

to the fee for the call completed.

The energizing of relay PI initiates furthermore the release of the group selector, the discriminator, and the assessor by short circuiting relay P at contact 50 pl. This releases, opens contacts-32p and 31p so that now relays VI and ZR also release. The release of relay VI allows in a manner with which we are not concerned the release of the group selector and also the release of the pre-selecting mechanism placed in front of the group selector the release of the pre-selector taking place by the opening of contact 5lvl whereby the pole of the battery is removed from lead l Furthermore the following circuit is established for rotary magnet Dml at contact 5211!: pole of battery, magnet Dml, off normal contact 53kml, contact 5217!, breaking switch 54, pole of, battery. The discriminator is switched to its rest position in which it remains since contact 53km! is open. The closing of contact 5511! results in the switching of the assessor to the rest position and so in the following circuit pole of battery, contacts 4Ic, 56p, magnet Dab, contact 'lkab, breaking switch 58, contact 550i, pole of battery, the assessor reaches its rest position and remains there since contact 517mb is then open.

The case may now be considered in which the same call which has been established by an entitled subscriber-is sought by a non-entitled subscriber. For this call the non-entitled subscriber can only reach the group selector over the path a2 to b2 since the entry is already selected.

In the seizing lead 02 lies relay BR which energizes and-closes its contacts 59M and 60hr.

If by thefourth impulse train wiper I0 is again set o-n contact 2!, since contact 59191 is closed r-e-- lay P:is short-circuited pole of battery, contact 49hr, wiper l0, contacts 2| and 59hr, wiper- 35); .Relay P thus releases. It opens contacts 32pand'3'lp, thereby preventing the further reception; of numerical impulses, and closes among othersits contact Sip and whereby a. buzzer .is connected tov winding III of". relay A since relay HR: also energizes and the. contact 62hr isclosed. Thev calling subscriber receives a buzzing. signal andknows from this'that he cannot. obtain his desired call. By using a special buzzer which differentiates between free. and engagedsignalsvv the calling subscriber can. tell that he has tried to establish a call which .is engaged;

It thecalling subscriber. now replaces his receiver the call is not charged for, because the circuit for the rotary magnet. of the assessor .cannot be completedisince contact 45p is open.. Consequently relay VI does not remain energized by its winding II since contact 32pis. open. Later also: no energizing of relay. ZR takes place onaccount of contact 31p being open.v After relay A deenergizes, relay Vl' also releases and. allowslof the release of the. group selector; sets. free-the preselecting device which had kept: this seized, and releases thediscriminatorx:

If the fourth impulse. train transmittedfrbm the calling station, independent of whether iticoncerns an entitled subscriber or a non-entitled-subscriber, consisted of eight. impulses, the-wiper: H) of the discriminator ML wasplaced on contact 63. This contact 63 is. connected with contact64 of the assessor. Since contact fi3Ifis-the. second contact in the bank, reckoned from the rest.posi.- tion of the discriminator, it. is. clear. that those contacts on which the wiperofl the discriminator has been set by non-controlling impulse trains, can also-be connected by the. control of impulse trains. The driving. magnet Dml of the'discrimninator. is not influenced since. the. wiper .62. comes into contact for the second time-Withbontact HI, because the contact. 9hr is open and hence the completion of. the. circuit for the driving; magnet at theendof the fourthimpulse train cannot take place.

The registering of thecall is;-effected'-in=tlie;way. described above.

If wiper I0 is set on; contact:.65 throughrthe fourth impulse train controllingthe discriminator, it is characteristic. that: the; calling. station must be switched over to. another: line; for examplev toa. final selector-belongingto; aparticular; groups; Ac-. cordingly relay U is energized over this :conta'ct of thediscriminator at the end of the impulse train andthence after the release of relay. V2 and the closing ofxcontact' 66122 and promotes the subscribers reversal'in the known. way which we are not here concerned with, through closing contact Bluover lead (II, or 112, according to which class the subscriber of the calling station belongs.

Cases can now be considered, Fig. 4, having a. definite call direction which result in controlling: by the second impulse train. This is attained by: the contactGBlcgw closing after the setting of the; first. group selector on the contact group concerned e. g. the fifth contact group. On the de-- energizing of relay V2 and the closing of contact 6902 relay HR immediately energizes through its" winding II and prepares-the circuit for the driving magnet Dml of the discriminator, over: whiclr this is already operated by the second impulse train.

In, the example just described the discriminator is stepped on two places by each of the non--. controlling impulse trains, one step occurring at; the beginning and the second at the end of the impulse trains. It is also possible-however for the discriminator to be advanced onlyone step by each ofthe non-controlling impulse trains. This V is for example readily possible in the present embodiment, if the step switching device serving for a discriminator has an indirect drive, that is to say a drive by which the advancement of the wiper first occurs on the deenergizing of the rotary magnet. In this case the rotary magnet would receivea current by the closing of contact 5222 at the beginning of an impulse train, but an advancement of the wiper does not result from this, but first occurs whenat the end of the impulse train its circuit is broken by the opening of contact 5122. 1

The advancement of the discriminator through only one step with every noncontrolling impulse can also be accomplished with stepping switches which immediately make one step on the energizing of the driving magnet. Figures 2 and 3 show the principle of two such examples of application. In these figures only the circuit for the discriminator'is shown, and the individual parts of the circuit, which correspond to those of Figure 1 have the same reference characters.

Figure 2 shows an arrangement by which the advancement of the discriminator by one step occurs at the end .of each noncontrolling impulse train. For this object a delayed relayV3 is pro-- vided which is operated through the energizing of relay V2 at the beginning of each impulse train, over its contact 80222. Relay V3 closes its contact 83223 and thereby prepares the energizing circuit for the magnet Dml. When relay V2 releases at a the endof the impulse train it closes its contact 82112 and contact 80112 opens. Since, however, relay V2 is provided with a delayed armature release, contact 8303 remains closed for some time and the following circuit for the rotary magnet Dml is setup: pole of battery, rotarymagnet Dml, wiper 6, contacts 8|, 8202, 83113, 822i, 9hr, pole of battery. The discriminator is displaced by 1 space to prevent a further energizing. of the rotary magnet in the second switching, when contact 83123 will still be closed, wiper 6 is made in such a way that while moving from one contact to another it connects these two contacts to- 'gether,'a release of the rotary magnet Dml between two contacts and hence a renewed energiz ing on the second contact, when contact 8303 will still be closed, is thus definitely prevented.

At the end ofthe second impulse train wiper 6 is brought to contact 84. The winding I of relay HR is connected to this but the former is first allowed to receive current at the end of the third impulse train. In order to prevent this Winding receiving current after the advancement of the discriminator at the end of the second impulse train whencontact 83113 will still be closed after the stepping operation of the discriminator, it is short circuited through a-contact dml of the rotary magnet'of the discriminator. Contact 83113 opens so'that Dml releases and the winding I of relay HR is connected. At the end of the third impulse train current flows through the winding on the closing, of contact 82112 and energizes relay HR. Magnet Dml cannot, however, energize on account of its high resistance. Relay HR thus brings about the circuit change illustrated by Fig. 1. s

Fig. 3 shows a mode of application in which ,the'advancement of the discriminator by one stepoccurs at the beginning of each noncontrolling impulse. For this purpose a relay V3 is provided which is slow to energize, this is activated by'the energizing of relay V2 at the beginning of the impulse train, over contact v2. Relay V2,

moreover, closed its contact 92222 and thereby completed the circuit for Dml pole of battery, rotary magnet Dml, wiper 6, contacts 9|.

92122, 9303, 811i, 9hr pole of battery; After a short time relay V3 energizes and opens contact 93113 breaking the circuit just described. A double energizing of the rotary magnet at'the beginning of' an impulse train, when contact- 9313 will no longer be open after the switching operation, is prevented, in the same way as by the arrangement of Fig. 2, in that the wiper 6,

when resting in a position between two contacts connects the two together.

At the beginning of the third impulse train wiper 6 is stepped on to contact 94.-'This results in the energizing of relay HR which is con nected tothis contact, but not until the end of the third'impulse train after the release of relay-V2 the following circuit: pole of battery,

rotary magnet Dml, wiper 6, contact 94, winding 1 of relay HR, contacts I202, 817], 9hr, pole of battery. Relay HR thus effects the circuit change explained in the description of Fig; 1.

Fig 4 shows an arrangement by which it is pos- I has been set on a definite contact group. In this case pole of the battery is connected to lead 39 at the above second group selector, relay (3' energizes and over its contact 969 lay HR through winding II.

.If in most calling routes in an arrangement a definite number of numerical impulse trains are to be noncontrolling it is possible by setting up asuitable controlling device to allow a larger number of numerical impulse trains to pass through the discriminator without controlling. This can also result by using a relay G, as in Figure 4, in which this relay on energizing disenergizes reconnects the winding I of relay HR'from con-- tact l5, (Fig. 1) and connectsit to a succeeding contact, for example contact 13, if a fourth impulse train is to be noncontrolling in this call direction, and thus connects contacts" I5 and 14 with contacts 502 and I202. 'The energizing of relay G can take place after the transmission of the second impulse train from thesecond group selector, or alternatively after the setting of the first group selector, through an 'ofi normal contact of this selection. 7

Having described the invention, what is considered to be new and is desired to be protected by Letters Patent will be set forth in the following claims. 1

What is claimed is:

1. In a. telephone system, a trunk line, a discriminator switch in said trunk lineresponsive to a series of impulses transmitted over said trunk line to saidswitch, said switch operated in a definite manner independent'of the number of impulses in the series, switching means in said switch, means responsive to the termination of said impulse series for operating said switching means, and means responsive to the operation to a plurality of series of impulses transmitted over said trunk line, said switch operated in a particular manner by a number of series of impulses independent of the number of impulses in the series, a relay in said switch, said relay operated responsive to the termination of said series of impulses, and means controlled by the operation of said relay for conditioning said discriminator switch to be direotively operated by additional series of impulses in a manner in accordance with the impulses in the series 3. In a telephone system, a discriminator switch, a trunk line extending to said switch over which a plurality of series of impulses are transmitted to said switch, said switch operated responsive to said impulse series to advance two steps for each series of said impulses, and means operated responsive to the termination of said impulse series for conditioning said switch to operate responsive to further series of impulses in accordance with the number of impulses in the series.

4. In a telephone system, a trunk line, a discriminator switch in said trunk line responsive to series of impulses transmitted to said switch over said trunk line, said switch operated by said series of impulses one step at the beginning and one step at the end of the impulse series regardless of the number of impulses in the series, and means responsive to the termination of the impulse series for altering the operation of the switch so as to operate in accordance with the number of impulses of additional series of impulses.

5. In a telephone system, a trunk line, over which a plurality of series of impulses are transmitted, a discriminator switch in said trunk line, said switch operated by said series of impulses to advance one step at the beginning and one step at the end of the impulse series regardless of the number of impulses in the series, means responsive to the cessation of the last impulse of the series for conditioning said switch for different operation, said switch thereby operated by additional series of impulses to advance step-by-step in accordance with each impulse of the .additional impulse series.

6. In a telephone system, a trunk line over which series of impulses including controlling and non-controlling series are transmitted, a discriminator switch in said trunk line, said switch operated responsive to the reception of a non-controlling series of impulses to advance a definite number of steps regardless of the number of impulses in the series, switching means operated by said switch, said switching means altering the operation condition of said switch, and means responsive to the reception of a controlling series of impulses for advancing said switch in accordance with the impulses of the controlling series.

7. In a telephone system as claimed in claim 2 in which the relay is connected to the position in the bank on which the switch has been positioned in order to condition the switch for the directive reception of the impulse series.

WALTER PINELL. 

